Measurement of Chloride Content in Recycled Fine Aggregate Produced from Waste Marine Concrete Using Fluorescent X-Ray Analyzer

• Published in: Concrete Research and Technology Vol. 24; no. 2; pp. 19 - 28
• Main Authors: Amino, Takahiko, Habuchi, Takashi
• Format: Journal Article
• Language: Japanese; English
• Published: Japan Concrete Institute 2013
• Subjects: Chloride Content; Light-Element Measurable Energy Dispersive X-Ray Analyzer; Recycled Aggregate; Waste Marine Concrete
• ISSN: 1340-4733; 2186-2745
• DOI: 10.3151/crt.24.19

This paper describes the applicability assessment of light-element measurable energy dispersive fluorescent X-ray analyzers to estimate the chloride content of recycled fine aggregate produced from waste marine concrete. In this study, various types of chloride-containing recycled fine aggregate were prepared. Then, the water soluble chloride content and the total chloride content of each type of aggregate and its fluorescent X-ray intensity were measured by using non-treated samples of each aggregate and samples crushed to a size of less than 0.15 mm. It was found that the relation between the fluorescent X-ray intensity and the chloride content could be represented by one equation not dependent on the type of aggregate, and that the X-ray intensity had a high correlation with the total chloride content. Furthermore, it was determined that samples crushed to a size of less than 0.15 mm should be used in order to improve the estimate accuracy. Lastly, a procedure for the estimation of the chloride content of fine aggregate produced from waste marine concrete using a light-element measurable energy dispersive fluorescent X-ray analyzer was proposed.